I know it might sound like a weird angle but I have experience of none conventional relationships. perhaps you could give him so symbol that you don't want him to ever, ever let you go, no matter what you might say or do at the time.

In BDSM we wear a collar, that is usually locked round the neck, for the sake of it passing in the "vanilla" world, it is usually just a decorative metal band, or a chain, tho women can get away with wearing leather.

I'm not sure if such a thing would be even close to suitable for you, and it certainly is not a substitute for talking and explaining things. But it can help you remember when you mind goes to the wrong place.

Maybe you could do something permanent like get a tattoo?

again I'm just thinking out loud here, other people feel free to tell me I'm being dumb.

If you want to talk to me privately about anything then just send me a PM or add me to messenger.